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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Manufacturing Process Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Manufacturing Process Engineers
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Volume & Issues
Volume 7, Issue 4 - Dec 2008
Volume 7, Issue 3 - Sep 2008
Volume 7, Issue 2 - Jun 2008
Volume 7, Issue 1 - Mar 2008
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A Study on Effect of Nitrogen Ion Implantation on Improvement of Surface Properties of Tool Steel
Kim, Hwa-Jeong ; Kim, Yohng-Jo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 3~9
The ion implantation technology is generally used in order to improve surface mechanical properties, especially tribological properties, of engineering metals. In this study, experimental works were carried out to investigate the surface properties, such as hardness, wear quantity, wear rate and friction force, of a nitrogen ion implanted tool steel STD11 under dry condition. Specimens for the wear test were made to investigate the influences of the initial ion implantation temperature and the total ion radiation. Wear properties, such as the wear quantity and the wear rate, of the nitrogen ion implanted tool steel were considerably improved, especially under the low sliding speed and the low applied load.
A Study on Electromagnetic Interference Shielding Effectiveness of the Aluminum film, Conductive Fabric and Nano Carbon black/Carbon Fiber Reinforced Composites
Han, Gil-Yeong ; Song, Dong-Han ; Bae, Ji-Su ; An, Dong-Gyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 10~16
This study investigated electromagnetic interference(EMI) shielding effectiveness(SE) of the aluminum film, conductive fabric and nano carbon black carbon fiber reinforced composites. We fabricated carbon fiber reinforced composites filled with nano carbon black where they bonded aluminum film and conductive fabric. The measurements of SE were carried out frequency range from 300MHz to 1.5GHz. It is observed that the SE of the bonded aluminum film and conductive fabric composites is the frequency dependent, increase with the increase in filler nano carbon black content. The aluminum film bonded composites showed higher SE compared to that of carbon black and conductive fabric. The aluminum film bonded epoxy composite was shown to exhibit up to 80dB of SE. The result that aluminum film bonded composite can be used for the purpose of EMI shielding as well as for some microwave applications.
Development of Die Technology of Mobile Phone Camera Module
Park, Joon-Hong ; Jeon, Eon-Chan ; Kim, Tae-Ho ; Moon, Soon-Kyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 17~23
Development of die technology for holder and barrel dies is necessary according to minimization of lens assembly, image sensor, and connectors. In these cases, there are two technical problems arising from die design. One is determination of knock-out pin location in die set. Minimization of lens assembly size make it difficult to obtain ejecting space. The other is whether or not high-precision die technology is possible to reduce torque variation when holer and barrel products is assembled. In this study, multi-cavity die set was developed taking advantage of gear-driven ejecting method. In the developed technology, die manufacturing technology was guaranteed with a high-precision level.
A study of manufacture of IPMC actuator and the high molecule finite element analysis
Kim, Se-Hun ; Cho, Seok-Min ; Lee, Dong-Weon ; Park, Young-Chul ; Kang, Joung-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 24~30
The laminate IPMC actuator have been developed with a commercial Nafion film and platinum electrodes. Equivalent beam and equivalent bimorph beam models for IPMC(Ionic Polymer-Metal Composite) actuators are described. By using a beam equation with estimated physical properities and actuation displacements of a cantilevered IPMC actuator are estimated. And Finite element analysis(FEA) was done by ANSYS.
Optimal Blank Design using Virtual Try-Out Method
Ko, Dae-Lim ; Jung, Dong-Won ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 31~36
Sheet metal forming has some merits that are less loss of materials in process, less time-consuming and it makes mass product possible. The product produced by sheet metal forming process has high strength compared to the weight and better surface characteristics. Therefore, sheet metal forming process is a lot used in automobiles, aircrafts, electronics and appliances. This paper made the process design for forming Bracket Front Back Frame Lower, determined the blank shape and size using PAM-STAMP, commercial software and evaluated formability. It has been proved that the optimal blank through the result forming analysis has advantage in terms of formability and spring back compared to the rectangular blank.
Optimum Working Condition of Al 2024 Alloy in Side Wall End Milling
Hong, Do-Kwan ; Ahn, Chan-Woo ; Park, Jin-Woo ; Baek, Hwang-Soon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 37~43
Working condition is one of the most important factors in precision working. In this study, we optimized the vibration acceleration level(VAL) of Al 2024 alloy to select optimum working condition of side wall end-milling using RSM(Response Surface Methodology). RSM was well adapted to make analytic model for minimizing vibration acceleration, created the objective function and saved a great deal of computational time. Therefore, it is expected that the proposed optimization procedure using RSM can be easily utilized to solve the optimization problem of working condition. The experimental results of the surface roughness and VAL showed the validity of the proposed working condition of side wall end-milling as it can be observed.
A Study on Static-Implicit Forming Analysis of the Magnesium Alloy Sheet
Son, Young-Ki ; Jung, Dong-Won ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 44~49
The characteristic of magnesium alloy is the most light in utility metal, the effect of electromagnetic wave interception, excellent specific strength and absorptiveness of vibration. Although magnesium alloy with above characteristic is a subject matter which is suitable in world-wide tendency of electrical component frame, sheet magnesium alloy is difficult to process. Therefore, forming analysis of sheet magnesium alloy and applying warm-working to process are indispensable. Among Finite element method, the static implicit finite element method is applied effectively to analyze sheet magnesium alloy stamping process, which include the forming stage. In this study, it was focused on the crack, wrinkling and spring back on sheet magnesium alloy stamping by the static implicit analysis. According to this study, the result of simulation will give engineers good information to access the forming technique on sheet magnesium alloy. And its application is being increased especially in the production of electrical component frame for the cost reduction, saving of defective ratio, and improvement of Productivity.
Gear Train Development for CNC Wire Bending Machine
Cho, Hyun-Deog ; Choi, Sung-Jong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 50~55
CNC wire bending machines are used in industries to make a type variety of wire products such as long links. The machines have a long arm device to rotate in order to remove forming errors by flexibility of wire. Generally, the machines which constructed servo motors in the arm have the rotating range of the arm under 360 degree because the servo motors connect with fixed control devices on frame by many cables. The rotating angle under 360 degree limits working speed and forming geometry. Therefore this study developed a gear train to drive a parts in arm and to be independent on arm rotation movement. The developed gear train can transfer four movements to four components in arm and is consists parallel of four pairs of satellite gear trains. This study constructed the CNC wire bending machine with the developed gear train and verified that the gear train could drive internal components independently on arm rotation.
Forging of Valve Fitting Products for Semi-Conductor Industry Using a Super-High Speed Shearing Process
Park, Joon-Hong ; Jeon, Eon-Chan ; Kim, Tae-Ho ; Kim, Hyung-Baek ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 56~61
Cropping metal materials is widely used for feeding processes of various forming method, such as forging, extrusion, drawing, and upsetting. However, cropping has many weak points, which are material loss in part of cutting, chip creation, and much use of lubrication oil, etc. In this study, instead of cropping, a novel process is proposed to cut metal materials, especially stainless steel bar which is known very difficult to crop. Results of FE-analysis will be shown to verify the proposed method comparing with those of the conventional cropping process. Also, fitting products were successfully forged using the fabricated billet by the proposed process.
An Investigation on the Mechanical Behaviors of Lubricant and Coating to Improve the Drawability of Non-heat Treated Steels
Lee, Sang-Jun ; Yoo, Ui-Kyung ; Lee, Young-Seog ; Byon, Sang-Min ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 62~67
In this research, we developed a pilot wire-drawing machine as well as wire end-pointing roller. Using these machines, we performed a pilot wire-drawing test at different coating material and lubricant when the reduction ratio is 10 %. To inversely compute the friction coefficient between the coating layer of wire and the surface of die for a specific lubricant, we carried out a series of three dimensional finite element analysis. Results show that the drawing force is varied with the coating material of wire at the same reduction ratio and lubricant. It is noted that the frictional coefficient in drawing is dependent on the coupled property of coating material and lubricant, indicating the best coating material for a given lubricant.
A Study on the Painting Characteristics of Waterborne Paint for Automotive Refinish
Kim, Soon-Kyung ; Kim, Moon-Kyung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 68~75
This paper investigates the correlation between surface roughness and gloss of aluminium sheet painted waterborne paint. One customer criterion of automotive quality is the as-painted appearance of the final products. Especially, the current emphasis on control of surface roughness of sanded aluminium sheet has been prompted by the automotive industry's concern with the as-painted appearance. because the influence of such characteristics on paintability, and painted appearance is important in defining outer panel requirements for automobile. This paper is dedicated primarily to the issue of painted appearance and reviews for improvement of roughness. The conclusions are obtained as follows ; 1) Painted aluminium sheet appearance is strongly affected by surface roughness of base-metal and influenced by sand paper and sanding method. 2) The painted appearance of aluminium sheets was determined and related to surface roughness parameters, combination of sand paper.
Analysis method on Structural Safety Evaluation of Butterfly Valve of Piping for LNG carrier
Park, Young-Chul ; Park, Han-Seok ; Kim, Si-Pom ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 76~81
A cryogenic butterfly valve is used to transfer the liquefied natural gas (LNG) which temperature is
. This valve is core part in the piping system using LNG. This paper performed coupling analysis using FEM to evaluate safety of cryogenic butterfly valve. Flow analysis is calculated numerically the CAE and CFD methods are useful to predict the thermal matter and the inner flow field of the valve. Thermal analysis and structural analysis used ANSYS Workbench.
An Analysis for the Course-Embedded Assessment Tool to Validate Program Outcomes
Shin, Haeng-Ja ; Kim, Si-Pom ; Kang, Won-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 82~95
As society has changed to being more knowledge-based, it is necessary that change of paradigm is incorporated into engineering education and the education goals and the assessment method of educational outcomes is developed to promptly meet the needs of the times. A purpose of this study is to measure learning outcomes in coursework of engineering college every semester, which ultimately provides to validate program outcomes. We looked into teaching-learning style of course in the engineering college and analyzed its grade method and tool. By use of a survey, we derived a reasonable method to measure for the learning outcomes in course and presented tools for course-embedded assessment to measure that learning outcomes had been tied to their objectives. These tools are effective to determine that program outcomes and education goals have been achieved, ultimately. In addition, it will help that instruction builds a loop system for better.
Ultra Precision Machining Technology Development of Subminiature Optics of Proximity and Wide Field of View
Kim, M.S. ; Yang, S.C. ; Kim, H.S. ; Kim, G.H. ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 96~101
Due to improve form accuracy and surface roughness of a aspheric lens core that is made of Ni, the study is carried out on localization about a Subminiature Optics of Proximity and Wide Field of View. The required form accuracy P-V 0.2
and surface roughness is Ra 10 nm. The design of experiment(DOE) is adopted to find a optimal cutting conditions which are spindle speed, depth of cut, feedrate. Finally, the effects of this study are replacing importation and strengthening competitiveness through the localization of the Subminiature Optics of Proximity and Wide Field of View.
Analysis on Fatigue Fracture at Cam Shaft
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 102~108
This study investigates the fatigue life and the damage possibility of cam shaft by the fatigue tool of Ansys. Among nonconstant fatigue loads, the case of 'SAE Bracket History' which is severest at the variation of load tends to be most unstable. The maximum relative damage in case of 'SAE Bracket History' is occurred near the average stress '0' and this case can be shown to have the possibility to take more damage than other cases. The case of 'Sample History' which becomes a little slow at the variation of load tends to be most stable. But there is most damaged possibility of 5% as 7 times at the range of mean stress from 0Pa to -104MPa and amplitude stress from 0MPa to 104MPa than the case of 'SAE Bracket History' or 'SAE Transmission'.
Analysis of Shape Characteristics of Wear Particles with Fractal Parameters
Cho, Yon-Sang ; Kim, Young-Hee ; Park, Heung-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 109~114
The fractal dimension aims to quantitatively define the irregular characteristics of the shape in nature. It can be useful in describing morphological characteristics of various wear particles. This paper was undertaken to diagnose failure condition for sliding members in lubrication using fractal dimension. The experiments were undertaken to analyze the shape of wear particles and to diagnose failure condition for sliding members in lubrication using the image processing and the fractal parameters. It was possible to diagnose wear mechanism, friction, and damage state of machines through analysis of shape characteristics for wear particle in driven condition using fractal parameters.
Analytical Model in Pedestrian Accident by Van Type Vehicle
Ahn, Seung-Mo ; Kang, Dae-Min ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 115~120
The fatalities of pedestrian accounted for about 40.0% of all fatalities in Korea (2005 year). In pedestrian involved accident, the most important data to inspect accident is throw distance of pedestrian. The throw distance of pedestrian can be influenced by many variables, such as vehicular frontal shape, vehicular impact speed, the offset of impact point, the height of pedestrian, and road condition. The trajectory of pedestrian after collision can be influenced by vehicular frontal shape classified into sedan type, box type, SUV type and van type. Many studies have been done about pedestrian accident with passenger car model and bus model for simple factors. But the study of pedestrian accident by van type vehicle was much insufficient, and even that the influence of multiple factors such as the offset of impact point was neglected. In this paper, a series of pedestrian kinetic simulation were conducted to inspect relationship between throw distance and multiple factors with using PC-CRASH s/w, a kinetic analysis program for a traffic accident for van type. By based on the simulation results, multi-variate regression was conducted, and regression equation was presented.
Development of Automatic Grease Lubricator for Gas Generation Type of Galvanic Electricity
Wang, Deok-Hyeon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 121~127
Automatic grease lubricator is an equipment that provides adequate amount of fresh grease constantly to the shaft and bearings of machines. It minimizes the friction heat and reduces the friction loss of machines to the least. This paper is developing an automatic grease lubricator using a mode of the gas generation type from galvanic electricity. The ultimate goal of this equipment is to lubricate an adequate amount of grease with galvanic corrosion. In an electrolyte, combining anode(Mo) with cathode(Zn) is pressing out hydrogen gas of an galvanic element with galvanic reaction. The characteristics of this method is continuous flowing small hydrogen gas and controling the usage of the amount of the generation of hydrogen gas. The exterior body of grease lubricator was analyzed by Digital Mock-up of CATIA V5 and finite element analysis. The maximum stress is distributed over the outlet part where the grease lubricator suddenly narrowly contracts. The outlet part is analyzed with different constructed angle due to the different loading and setting angles. Using the analyzed design, RP trial products were producted and tested.
Modeling of Deposition Height in the Uncontrolled Laser Aided Direct Metal Deposition Process
Chang, Yoon-Sang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 128~134
Models of the deposition heights in the uncontrolled laser aided direct metal deposition process are constructed for the enhancement of the process integrity. Linear and non-linear statistical models as well as fuzzy model are utilized as the modeling methods. The predictability of the models are evaluated with the values of the sum of square error. The algorithm to use the models in the feedback controlled system is suggested to increase the deposition height accuracy within a layer.
A Study on the Optimum Design of Independent Suspension Final Reduction Gear
Jo, Young-Jik ; Jeon, Eeon-Chan ; Kang, Jung-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 135~141
Independent suspension axle and final reduction gear for special-purpose vehicles such as a armored vehicles are almost imported in Germany etc. so, developing them is necessary to save cost. In severe condition (open fields, water surface driving, obstacle pass), special-purpose vehicles must work well. Drop box, axle and final reduction gear performed static analysis. We know that is possible weight reduction. The purpose of this paper is to find out the optimal shape of final reduction gear's case by means of response surface methodology. The response surface method is the statistical method which can be applied to the non-sensitivity based optimization. The response surface which is constructed by the least square method contains only the polynomial terms so that the global maximum and minimum points are easily obtained.
A study on the Optimum Wheel Characteristics Using Grinding Machine
Ko, Jun-Bin ; Kim, Woo-Kang ; Jeon, Tek-Jong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 142~148
This study aims to find the optimal cutting conditions, which are obtained by grinding condition, and the grinding characteristics and condition of constant velocity joint were investigated with respect to wheel velocity, depth of cut, feed speed. Grinding machine has been widely used in manufacturing optical reflects of metal. Such as steel are easy to be machined because of their proper material. As a result I obtained the data of grinding conditions makes good surface roughness and the optimal condition of grinding and get the mesh condition. The purpose of this study is to find the optimum grinding wheel characteristics for cutting constant velocity joint.
A Structural Design of Microgyroscope Using Kriging Approximation Model
Kim, Jong-Kyu ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 149~154
The concept of robust design was introduced by Dr. G. Taguchi in the late 1940s, and his technique has become commonly known as the Taguchi method or the robust design. In this research, a robust design procedure for microgyroscope is suggested based on the kriging and optimization approaches. The kriging interpolation method is introduced to obtain the surrogate approximation model of true function. Robustness is calculated by the kriging model to reduce real function calculations. For this, objective function is represented by the probability of success, thus facilitating robust optimization. The statistics such as mean and variance are obtained based on the reliable kriging model and the second-order statistical approximation method.
A Study on Design of Forming Process of Tube-end for Brake of Automobiles
Jea, Wone-Soo ; Ye, Sang-Don ; Min, Byeong-Hyeon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 4, 2008, Pages 155~160
End part of the brake tube formed with the shape of snake head is important for the braking of automobile in safety because it has to prevent crack, fracture and defects occurred during the forming process. Especially, the shape of tube end has influence on the ability of brake. Based on the procedure of process design, in this paper, the forming operation is done by finite element method and the design variables are analyzed by Taguchi method. Design variables such as the outer angle of tube end with the shape of snake head(A), the inner angle to make a hole at tube end with the shape of snake head(B) and the forming distance at tube end(C) are used. Optimization of design variables is performed to minimize the damage factor of the tube end occurred during the forming process. The value of damage factor of 0.327 was obtained under the optimal condition like
and C=5.3mm, respectively.